[tbb-bugs] #26600 [Applications/Tor Browser]: verify that new WebGL extensions are disabled

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#26600: verify that new WebGL extensions are disabled
-------------------------------------+-------------------------------------
     Reporter:  mcs                  |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-fingerprinting,
     Severity:  Normal               |  ff60-esr, TorBrowserTeam201807
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
-------------------------------------+-------------------------------------
 Support for two new WebGL extensions was added during the ESR60
 development cycle. We should verify that both are disabled via `webgl
 .disable-extensions` = `true` (which Tor Browser sets by default). See:

 ​https://bugzilla.mozilla.org/show_bug.cgi?id=1250077
 ​https://developer.mozilla.org/en-
 US/docs/Web/API/WEBGL_compressed_texture_astc

 ​https://bugzilla.mozilla.org/show_bug.cgi?id=1325113
 ​https://developer.mozilla.org/en-
 US/docs/Web/API/WEBGL_compressed_texture_s3tc_srgb

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26600>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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